Abstract
Thin liquid films are considered to be the basic structural elements of foam and emulsion systems. Consequently, the structure and stability of colloidal dispersions are highly dependent on the dynamic structure formation and stability of the single, thin, curved films between unequal-sized bubbles and droplets as in foam and emulsion systems. A novel experimental technique has been developed to investigate the dynamic behavior of such curved foam films. The effects of film size, curvature, micellar concentration and polydispersity on stratification within the curved films are discussed. It is noted that a critical film size exists below which the stepwise film thickness transitions (stratifications) do not occur and the film exists at an equilibrium with several micellar layers inside it. The film thickness transition and the spot formation appear to be due to the “vacancies condensation” mechanism.
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